Notes: The ASK statement
will display a message box and suspend program execution until the user
clicks on the YES or NO buttons. Clicking on the
YES button will place a 1 in the variable
while clicking on the NO button will return a 0.
textstring may consist of combinations of text and variables
to be printed in the message box. Text must be enclosed in quotes and must
be separated from variables by spaces.

Example:

# ASK example.# yes and no are pre-defined
in the following 2 statements